Read Docker and Swarm state through SDK

Author: magdielcardoso

cmd/stackhost/main.go

@@ -15,6 +15,7 @@ import (
 	"syscall"
 	"time"
 
+	dockerreader "github.com/StackLab-Digital/StackHost/internal/docker"
 	_ "github.com/mattn/go-sqlite3"
 	"golang.org/x/crypto/bcrypt"
 )
@@ -23,6 +24,7 @@ type app struct {
 	db            *sql.DB
 	sessionSecret string
 	events        chan map[string]any
+	docker        *dockerreader.Reader
 }
 
 func main() {
@@ -39,7 +41,8 @@ func main() {
 	if err = migrate(db); err != nil {
 		panic(err)
 	}
-	a := &app{db: db, sessionSecret: getenv("STACKHOST_SESSION_SECRET", "development-only-change-me"), events: make(chan map[string]any, 32)}
+	dr, _ := dockerreader.NewReader()
+	a := &app{db: db, sessionSecret: getenv("STACKHOST_SESSION_SECRET", "development-only-change-me"), events: make(chan map[string]any, 32), docker: dr}
 	s := &http.Server{Addr: addr, Handler: a.routes(), ReadHeaderTimeout: 10 * time.Second}
 	ctx, stop := signal.NotifyContext(context.Background(), os.Interrupt, syscall.SIGTERM)
 	defer stop()
@@ -419,6 +422,10 @@ func (a *app) eventsStream(w http.ResponseWriter, r *http.Request) {
 	}
 }
 func (a *app) infrastructure(w http.ResponseWriter, r *http.Request) {
+	if a.docker != nil {
+		json.NewEncoder(w).Encode(a.docker.Snapshot(r.Context()))
+		return
+	}
 	json.NewEncoder(w).Encode(map[string]any{"docker": map[string]any{"available": false, "message": "Docker não está conectado."}, "swarm": map[string]any{"active": false, "message": "O host não está conectado a um Swarm."}, "nodes": []any{}, "services": []any{}})
 }
 func (a *app) spa(w http.ResponseWriter, r *http.Request) {

go.mod

@@ -1,8 +1,37 @@
 module github.com/StackLab-Digital/StackHost
 
-go 1.23
+go 1.25.0
 
 require (
 	github.com/mattn/go-sqlite3 v1.14.24
 	golang.org/x/crypto v0.28.0
 )
+
+require (
+	github.com/Microsoft/go-winio v0.6.2 // indirect
+	github.com/cespare/xxhash/v2 v2.3.0 // indirect
+	github.com/containerd/log v0.1.0 // indirect
+	github.com/distribution/reference v0.6.0 // indirect
+	github.com/docker/docker v27.3.1+incompatible
+	github.com/docker/go-connections v0.5.0 // indirect
+	github.com/docker/go-units v0.5.0 // indirect
+	github.com/felixge/httpsnoop v1.0.4 // indirect
+	github.com/go-logr/logr v1.4.3 // indirect
+	github.com/go-logr/stdr v1.2.2 // indirect
+	github.com/gogo/protobuf v1.3.2 // indirect
+	github.com/moby/docker-image-spec v1.3.1 // indirect
+	github.com/moby/term v0.5.2 // indirect
+	github.com/morikuni/aec v1.1.0 // indirect
+	github.com/opencontainers/go-digest v1.0.0 // indirect
+	github.com/opencontainers/image-spec v1.1.1 // indirect
+	github.com/pkg/errors v0.9.1 // indirect
+	go.opentelemetry.io/auto/sdk v1.2.1 // indirect
+	go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp v0.69.0 // indirect
+	go.opentelemetry.io/otel v1.44.0 // indirect
+	go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracehttp v1.44.0 // indirect
+	go.opentelemetry.io/otel/metric v1.44.0 // indirect
+	go.opentelemetry.io/otel/trace v1.44.0 // indirect
+	golang.org/x/sys v0.45.0 // indirect
+	golang.org/x/time v0.15.0 // indirect
+	gotest.tools/v3 v3.5.2 // indirect
+)

go.sum

@@ -1,4 +1,126 @@
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internal/docker/reader.go

@@ -0,0 +1,84 @@
+package docker
+
+import (
+	"context"
+	"fmt"
+	"os"
+
+	"github.com/docker/docker/api/types"
+	client "github.com/docker/docker/client"
+)
+
+type Reader struct{ client *client.Client }
+type Snapshot struct {
+	Available     bool   `json:"available"`
+	Message       string `json:"message,omitempty"`
+	EngineVersion string `json:"engine_version,omitempty"`
+	Containers    int    `json:"containers"`
+	Running       int    `json:"running"`
+	Images        int    `json:"images"`
+	Swarm         Swarm  `json:"swarm"`
+}
+type Swarm struct {
+	Active   bool   `json:"active"`
+	Message  string `json:"message,omitempty"`
+	NodeID   string `json:"node_id,omitempty"`
+	Nodes    int    `json:"nodes"`
+	Managers int    `json:"managers"`
+	Workers  int    `json:"workers"`
+	Services int    `json:"services"`
+}
+
+func NewReader() (*Reader, error) {
+	host := os.Getenv("STACKHOST_DOCKER_HOST")
+	opts := []client.Opt{client.FromEnv}
+	if host != "" {
+		opts = []client.Opt{client.WithHost(host)}
+	}
+	c, err := client.NewClientWithOpts(append(opts, client.WithAPIVersionNegotiation())...)
+	if err != nil {
+		return nil, err
+	}
+	return &Reader{client: c}, nil
+}
+func (r *Reader) Snapshot(ctx context.Context) Snapshot {
+	out := Snapshot{}
+	if _, err := r.client.Ping(ctx); err != nil {
+		out.Message = fmt.Sprintf("Docker indisponível: %v", err)
+		return out
+	}
+	out.Available = true
+	v, err := r.client.ServerVersion(ctx)
+	if err == nil {
+		out.EngineVersion = v.Version
+	}
+	info, err := r.client.Info(ctx)
+	if err == nil {
+		out.Containers = info.Containers
+		out.Running = info.ContainersRunning
+		out.Images = info.Images
+	}
+	swarm, err := r.client.SwarmInspect(ctx)
+	if err != nil {
+		out.Swarm.Message = "O host não está em um Swarm."
+		return out
+	}
+	out.Swarm.Active = true
+	out.Swarm.NodeID = swarm.ID
+	nodes, err := r.client.NodeList(ctx, types.NodeListOptions{})
+	if err == nil {
+		out.Swarm.Nodes = len(nodes)
+		for _, n := range nodes {
+			if n.Spec.Role == "manager" {
+				out.Swarm.Managers++
+			} else {
+				out.Swarm.Workers++
+			}
+		}
+	}
+	services, err := r.client.ServiceList(ctx, types.ServiceListOptions{})
+	if err == nil {
+		out.Swarm.Services = len(services)
+	}
+	return out
+}